India CMVR Amendment Proposal Expands Emission Norms to E100 and B100

On April 27, the Ministry of Road Transport and Highways (MoRTH) released a draft notification proposing updates to the Central Motor Vehicles Rules (CMVR), 1989. The proposal is currently open for public consultation for a period of 30 days following its Gazette publication. These amendments aim to modernize emission testing frameworks and align them with the growing adoption of alternative fuels in India’s automotive ecosystem. The proposed revisions reflect a strategic push toward cleaner mobility solutions while ensuring regulatory readiness for advanced fuel technologies.

Expansion of Emission Testing Thresholds

One of the key changes includes increasing the gross vehicle weight threshold in emission testing tables from 3,000 kg to 3,500 kg. This adjustment broadens the classification scope for vehicles undergoing emission compliance testing. By revising this threshold, regulators aim to better accommodate evolving vehicle categories and weight distributions, particularly as newer vehicle architectures and electrified platforms emerge. This change ensures that emission standards remain relevant across a wider range of vehicles operating within India.

Updated Ethanol Fuel Designations

The draft amendment proposes replacing the existing E85 designation with “E85 or E100” across multiple sub-rules under Rule 115. This update enables regulatory coverage for vehicles operating on 100% ethanol fuel. By formally incorporating E100 into emission testing and compliance frameworks, the amendment supports India’s ethanol blending and energy diversification goals. Additionally, the gasoline blend designation is proposed to be updated from E10/E to E10/E20, reflecting the country’s transition toward higher ethanol blending levels in conventional fuels.

Biodiesel and HCNG Corrections

Another significant revision involves replacing the B10 biodiesel classification with B100 in emission testing tables. This change extends regulatory applicability to vehicles running on pure biodiesel, aligning with sustainability and renewable fuel objectives. Furthermore, a correction has been proposed for HCNG fuel designation, updating it from “Hydrogen+CN” to the accurate “Hydrogen+CNG.” This correction eliminates ambiguity and ensures consistency in fuel nomenclature within regulatory documentation.

Annexure Updates and Technical Corrections

The amendment also includes renaming the test annexure for E100 vehicles from “Annexure S” to “Annexure SA,” improving clarity and differentiation within regulatory references. In addition to structural updates, several typographical corrections have been introduced across emission testing tables. These refinements enhance the accuracy and usability of the regulatory framework, ensuring that stakeholders can interpret and implement compliance requirements without discrepancies.

The proposed CMVR amendments represent a forward-looking regulatory shift designed to support alternative fuel adoption and evolving vehicle technologies in India. By expanding fuel definitions and refining testing parameters, the framework aims to maintain alignment with national sustainability goals and global emission standards.

Frequently Asked Questions

What is the purpose of the proposed CMVR amendments in India?
The proposed amendments aim to update emission regulations to accommodate evolving fuel technologies and vehicle categories. They introduce expanded emission testing thresholds, updated fuel classifications such as E100 ethanol and B100 biodiesel, and corrections in fuel designations. These changes support India’s transition toward cleaner fuels and ensure that regulatory frameworks remain aligned with technological advancements. Additionally, the amendments improve clarity in testing procedures and documentation, helping manufacturers comply more effectively with emission norms.

How do the new fuel designations impact vehicle compliance in India?
The inclusion of E100 ethanol and B100 biodiesel in emission norms allows vehicles using these fuels to be formally tested and certified under regulatory standards. This ensures that manufacturers can develop and deploy vehicles compatible with higher renewable fuel blends while maintaining compliance. The updated E20 gasoline blend designation also reflects India’s ethanol blending roadmap. Overall, these changes provide regulatory clarity and encourage the adoption of sustainable fuels in the automotive sector.